What is the diff btween a UF 980L and a

… WF 980 L. I know the UF one is supposed to be 980 lumens and is the one that gets all the hype and excitement and the WF says its 720 lumens. Has anyone actually done a side by side comparison? And does anyone know where to get the cheapest, like rock-bottom price for the Ultrafire UF 980 L? I’ve seen them from about $43 up to $99 depending on the various sellers.